blob: 95dad9d14cf10211156e1896c0e97d270d76ab2f [file] [log] [blame]
* fs/cifs/cifsglob.h
* Copyright (C) International Business Machines Corp., 2002,2008
* Author(s): Steve French (
* Jeremy Allison (
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* the GNU Lesser General Public License for more details.
#ifndef _CIFS_GLOB_H
#define _CIFS_GLOB_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "cifs_fs_sb.h"
#include "cifsacl.h"
#include <crypto/internal/hash.h>
#include <linux/scatterlist.h>
* The sizes of various internal tables and strings
#define MAX_UID_INFO 16
#define MAX_SES_INFO 2
#define MAX_TCON_INFO 4
#define MAX_SERVER_SIZE 15
#define MAX_SHARE_SIZE 80
#define MAX_USERNAME_SIZE 256 /* reasonable maximum for current servers */
#define MAX_PASSWORD_SIZE 512 /* max for windows seems to be 256 wide chars */
* default attribute cache timeout (jiffies)
#define CIFS_DEF_ACTIMEO (1 * HZ)
* max attribute cache timeout (jiffies) - 2^30
#define CIFS_MAX_ACTIMEO (1 << 30)
* MAX_REQ is the maximum number of requests that WE will send
* on one socket concurrently. It also matches the most common
* value of max multiplex returned by servers. We may
* eventually want to use the negotiated value (in case
* future servers can handle more) when we are more confident that
* we will not have problems oveloading the socket with pending
* write data.
#define CIFS_MAX_REQ 50
#define RFC1001_NAME_LEN 15
#define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
/* currently length of NIP6_FMT */
/* used to define string lengths for reversing unicode strings */
/* (256+1)*2 = 514 */
/* (max path length + 1 for null) * 2 for unicode */
#define MAX_NAME 514
#include "cifspdu.h"
* CIFS vfs client Status information (based on what we know.)
/* associated with each tcp and smb session */
enum statusEnum {
CifsNew = 0,
enum securityEnum {
LANMAN = 0, /* Legacy LANMAN auth */
NTLM, /* Legacy NTLM012 auth with NTLM hash */
NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */
RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */
/* NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
Kerberos, /* Kerberos via SPNEGO */
enum protocolEnum {
TCP = 0,
/* Netbios frames protocol not supported at this time */
struct session_key {
unsigned int len;
char *response;
/* crypto security descriptor definition */
struct sdesc {
struct shash_desc shash;
char ctx[];
/* crypto hashing related structure/fields, not specific to a sec mech */
struct cifs_secmech {
struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
struct crypto_shash *md5; /* md5 hash function */
struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
/* per smb session structure/fields */
struct ntlmssp_auth {
__u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
__u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
struct cifs_cred {
int uid;
int gid;
int mode;
int cecount;
struct cifs_sid osid;
struct cifs_sid gsid;
struct cifs_ntace *ntaces;
struct cifs_ace *aces;
* Except the CIFS PDUs themselves all the
* globally interesting structs should go here
struct smb_vol {
char *username;
char *password;
char *domainname;
char *UNC;
char *UNCip;
char *iocharset; /* local code page for mapping to and from Unicode */
char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
uid_t cred_uid;
uid_t linux_uid;
gid_t linux_gid;
mode_t file_mode;
mode_t dir_mode;
unsigned secFlg;
bool retry:1;
bool intr:1;
bool setuids:1;
bool override_uid:1;
bool override_gid:1;
bool dynperm:1;
bool noperm:1;
bool no_psx_acl:1; /* set if posix acl support should be disabled */
bool cifs_acl:1;
bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
bool server_ino:1; /* use inode numbers from server ie UniqueId */
bool direct_io:1;
bool strict_io:1; /* strict cache behavior */
bool remap:1; /* set to remap seven reserved chars in filenames */
bool posix_paths:1; /* unset to not ask for posix pathnames. */
bool no_linux_ext:1;
bool sfu_emul:1;
bool nullauth:1; /* attempt to authenticate with null user */
bool nocase:1; /* request case insensitive filenames */
bool nobrl:1; /* disable sending byte range locks to srv */
bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
bool seal:1; /* request transport encryption on share */
bool nodfs:1; /* Do not request DFS, even if available */
bool local_lease:1; /* check leases only on local system, not remote */
bool noblocksnd:1;
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
bool multiuser:1;
bool rwpidforward:1; /* pid forward for read/write operations */
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
unsigned short int port;
unsigned long actimeo; /* attribute cache timeout (jiffies) */
char *prepath;
struct sockaddr_storage srcaddr; /* allow binding to a local IP */
struct nls_table *local_nls;
struct cifs_mnt_data {
struct cifs_sb_info *cifs_sb;
struct smb_vol *vol;
int flags;
struct TCP_Server_Info {
struct list_head tcp_ses_list;
struct list_head smb_ses_list;
int srv_count; /* reference counter */
/* 15 character server name + 0x20 16th byte indicating type = srv */
char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
enum statusEnum tcpStatus; /* what we think the status is */
char *hostname; /* hostname portion of UNC string */
struct socket *ssocket;
struct sockaddr_storage dstaddr;
struct sockaddr_storage srcaddr; /* locally bind to this IP */
struct net *net;
wait_queue_head_t response_q;
wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
struct list_head pending_mid_q;
bool noblocksnd; /* use blocking sendmsg */
bool noautotune; /* do not autotune send buf sizes */
bool tcp_nodelay;
atomic_t inFlight; /* number of requests on the wire to server */
struct mutex srv_mutex;
struct task_struct *tsk;
char server_GUID[16];
char sec_mode;
bool session_estab; /* mark when very first sess is established */
u16 dialect; /* dialect index that server chose */
enum securityEnum secType;
unsigned int maxReq; /* Clients should submit no more */
/* than maxReq distinct unanswered SMBs to the server when using */
/* multiplexed reads or writes */
unsigned int maxBuf; /* maxBuf specifies the maximum */
/* message size the server can send or receive for non-raw SMBs */
/* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
/* when socket is setup (and during reconnect) before NegProt sent */
unsigned int max_rw; /* maxRw specifies the maximum */
/* message size the server can send or receive for */
unsigned int max_vcs; /* maximum number of smb sessions, at least
those that can be specified uniquely with
vcnumbers */
int capabilities; /* allow selective disabling of caps by smb sess */
int timeAdj; /* Adjust for difference in server time zone in sec */
__u16 CurrentMid; /* multiplex id - rotating counter */
char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
/* 16th byte of RFC1001 workstation name is always null */
char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
__u32 sequence_number; /* for signing, protected by srv_mutex */
struct session_key session_key;
unsigned long lstrp; /* when we got last response from this server */
struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
/* extended security flavors that server supports */
bool sec_ntlmssp; /* supports NTLMSSP */
bool sec_kerberosu2u; /* supports U2U Kerberos */
bool sec_kerberos; /* supports plain Kerberos */
bool sec_mskerberos; /* supports legacy MS Kerberos */
struct delayed_work echo; /* echo ping workqueue job */
struct fscache_cookie *fscache; /* client index cache cookie */
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
* Macros to allow the TCP_Server_Info->net field and related code to drop out
* when CONFIG_NET_NS isn't set.
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
return srv->net;
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
srv->net = net;
static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
return &init_net;
static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
* Session structure. One of these for each uid session with a particular host
struct cifs_ses {
struct list_head smb_ses_list;
struct list_head tcon_list;
struct mutex session_mutex;
struct TCP_Server_Info *server; /* pointer to server info */
int ses_count; /* reference counter */
enum statusEnum status;
unsigned overrideSecFlg; /* if non-zero override global sec flags */
__u16 ipc_tid; /* special tid for connection to IPC share */
__u16 flags;
__u16 vcnum;
char *serverOS; /* name of operating system underlying server */
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
int Suid; /* remote smb uid */
uid_t linux_uid; /* overriding owner of files on the mount */
uid_t cred_uid; /* owner of credentials */
int capabilities;
char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
TCP names - will ipv6 and sctp addresses fit? */
char *user_name; /* must not be null except during init of sess
and after mount option parsing we fill it */
char *domainName;
char *password;
struct session_key auth_key;
struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
bool need_reconnect:1; /* connection reset, uid now invalid */
/* no more than one of the following three session flags may be set */
#define CIFS_SES_NT4 1
#define CIFS_SES_OS2 2
#define CIFS_SES_W9X 4
/* following flag is set for old servers such as OS2 (and Win95?)
which do not negotiate NTLM or POSIX dialects, but instead
negotiate one of the older LANMAN dialects */
* there is one of these for each connection to a resource on a particular
* session
struct cifs_tcon {
struct list_head tcon_list;
int tc_count;
struct list_head openFileList;
struct cifs_ses *ses; /* pointer to session associated with */
char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
char *nativeFileSystem;
char *password; /* for share-level security */
__u16 tid; /* The 2 byte tree id */
__u16 Flags; /* optional support bits */
enum statusEnum tidStatus;
atomic_t num_smbs_sent;
atomic_t num_writes;
atomic_t num_reads;
atomic_t num_flushes;
atomic_t num_oplock_brks;
atomic_t num_opens;
atomic_t num_closes;
atomic_t num_deletes;
atomic_t num_mkdirs;
atomic_t num_posixopens;
atomic_t num_posixmkdirs;
atomic_t num_rmdirs;
atomic_t num_renames;
atomic_t num_t2renames;
atomic_t num_ffirst;
atomic_t num_fnext;
atomic_t num_fclose;
atomic_t num_hardlinks;
atomic_t num_symlinks;
atomic_t num_locks;
atomic_t num_acl_get;
atomic_t num_acl_set;
unsigned long long time_writes;
unsigned long long time_reads;
unsigned long long time_opens;
unsigned long long time_deletes;
unsigned long long time_closes;
unsigned long long time_mkdirs;
unsigned long long time_rmdirs;
unsigned long long time_renames;
unsigned long long time_t2renames;
unsigned long long time_ffirst;
unsigned long long time_fnext;
unsigned long long time_fclose;
#endif /* CONFIG_CIFS_STATS2 */
__u64 bytes_read;
__u64 bytes_written;
spinlock_t stat_lock;
#endif /* CONFIG_CIFS_STATS */
FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
bool ipc:1; /* set if connection to IPC$ eg for RPC/PIPES */
bool retry:1;
bool nocase:1;
bool seal:1; /* transport encryption for this mounted share */
bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol
for this mount even if server would support */
bool local_lease:1; /* check leases (only) on local system not remote */
bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
bool need_reconnect:1; /* connection reset, tid now invalid */
u64 resource_id; /* server resource id */
struct fscache_cookie *fscache; /* cookie for share */
/* BB add field for back pointer to sb struct(s)? */
* This is a refcounted and timestamped container for a tcon pointer. The
* container holds a tcon reference. It is considered safe to free one of
* these when the tl_count goes to 0. The tl_time is the time of the last
* "get" on the container.
struct tcon_link {
struct rb_node tl_rbnode;
uid_t tl_uid;
unsigned long tl_flags;
unsigned long tl_time;
atomic_t tl_count;
struct cifs_tcon *tl_tcon;
extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
static inline struct cifs_tcon *
tlink_tcon(struct tcon_link *tlink)
return tlink->tl_tcon;
extern void cifs_put_tlink(struct tcon_link *tlink);
static inline struct tcon_link *
cifs_get_tlink(struct tcon_link *tlink)
if (tlink && !IS_ERR(tlink))
return tlink;
/* This function is always expected to succeed */
extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
* This info hangs off the cifsFileInfo structure, pointed to by llist.
* This is used to track byte stream locks on the file
struct cifsLockInfo {
struct list_head llist; /* pointer to next cifsLockInfo */
__u64 offset;
__u64 length;
__u8 type;
* One of these for each open instance of a file
struct cifs_search_info {
loff_t index_of_last_entry;
__u16 entries_in_buffer;
__u16 info_level;
__u32 resume_key;
char *ntwrk_buf_start;
char *srch_entries_start;
char *last_entry;
const char *presume_name;
unsigned int resume_name_len;
bool endOfSearch:1;
bool emptyDir:1;
bool unicode:1;
bool smallBuf:1; /* so we know which buf_release function to call */
struct cifsFileInfo {
struct list_head tlist; /* pointer to next fid owned by tcon */
struct list_head flist; /* next fid (file instance) for this inode */
unsigned int uid; /* allows finding which FileInfo structure */
__u32 pid; /* process id who opened file */
__u16 netfid; /* file id from remote */
/* BB add lock scope info here if needed */ ;
/* lock scope id (0 if none) */
struct dentry *dentry;
unsigned int f_flags;
struct tcon_link *tlink;
struct mutex lock_mutex;
struct list_head llist; /* list of byte range locks we have. */
bool invalidHandle:1; /* file closed via session abend */
bool oplock_break_cancelled:1;
int count; /* refcount protected by cifs_file_list_lock */
struct mutex fh_mutex; /* prevents reopen race after dead ses*/
struct cifs_search_info srch_inf;
struct work_struct oplock_break; /* work for oplock breaks */
struct cifs_io_parms {
__u16 netfid;
__u32 pid;
__u64 offset;
unsigned int length;
struct cifs_tcon *tcon;
* Take a reference on the file private data. Must be called with
* cifs_file_list_lock held.
static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
* One of these for each file inode
struct cifsInodeInfo {
struct list_head lockList;
/* BB add in lists for dirty pages i.e. write caching info for oplock */
struct list_head openFileList;
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
bool clientCanCacheRead; /* read oplock */
bool clientCanCacheAll; /* read and writebehind oplock */
bool delete_pending; /* DELETE_ON_CLOSE is set */
bool invalid_mapping; /* pagecache is invalid */
unsigned long time; /* jiffies of last update of inode */
u64 server_eof; /* current file size on server */
u64 uniqueid; /* server inode number */
u64 createtime; /* creation time on server */
struct fscache_cookie *fscache;
struct inode vfs_inode;
static inline struct cifsInodeInfo *
CIFS_I(struct inode *inode)
return container_of(inode, struct cifsInodeInfo, vfs_inode);
static inline struct cifs_sb_info *
CIFS_SB(struct super_block *sb)
return sb->s_fs_info;
static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
return '/';
return '\\';
static inline void
convert_delimiter(char *path, char delim)
int i;
char old_delim;
if (path == NULL)
if (delim == '/')
old_delim = '\\';
old_delim = '/';
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == old_delim)
path[i] = delim;
#define cifs_stats_inc atomic_inc
static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
unsigned int bytes)
if (bytes) {
tcon->bytes_written += bytes;
static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
unsigned int bytes)
tcon->bytes_read += bytes;
#define cifs_stats_inc(field) do {} while (0)
#define cifs_stats_bytes_written(tcon, bytes) do {} while (0)
#define cifs_stats_bytes_read(tcon, bytes) do {} while (0)
struct mid_q_entry;
* This is the prototype for the mid callback function. When creating one,
* take special care to avoid deadlocks. Things to bear in mind:
* - it will be called by cifsd, with no locks held
* - the mid will be removed from any lists
typedef void (mid_callback_t)(struct mid_q_entry *mid);
/* one of these for every pending CIFS request to the server */
struct mid_q_entry {
struct list_head qhead; /* mids waiting on reply from this server */
__u16 mid; /* multiplex id */
__u16 pid; /* process id */
__u32 sequence_number; /* for CIFS signing */
unsigned long when_alloc; /* when mid was created */
unsigned long when_sent; /* time when smb send finished */
unsigned long when_received; /* when demux complete (taken off wire) */
mid_callback_t *callback; /* call completion callback */
void *callback_data; /* general purpose pointer for callback */
struct smb_hdr *resp_buf; /* response buffer */
int midState; /* wish this were enum but can not pass to wait_event */
__u8 command; /* smb command code */
bool largeBuf:1; /* if valid response, is pointer to large buf */
bool multiRsp:1; /* multiple trans2 responses for one request */
bool multiEnd:1; /* both received */
/* Make code in transport.c a little cleaner by moving
update of optional stats into function below */
static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
mid->when_sent = jiffies;
static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
static inline void cifs_save_when_sent(struct mid_q_entry *mid)
/* for pending dnotify requests */
struct dir_notify_req {
struct list_head lhead;
__le16 Pid;
__le16 PidHigh;
__u16 Mid;
__u16 Tid;
__u16 Uid;
__u16 netfid;
__u32 filter; /* CompletionFilter (for multishot) */
int multishot;
struct file *pfile;
struct dfs_info3_param {
int path_consumed;
int server_type;
int ref_flag;
char *path_name;
char *node_name;
* common struct for holding inode info when searching for or updating an
* inode with new info
struct cifs_fattr {
u32 cf_flags;
u32 cf_cifsattrs;
u64 cf_uniqueid;
u64 cf_eof;
u64 cf_bytes;
u64 cf_createtime;
uid_t cf_uid;
gid_t cf_gid;
umode_t cf_mode;
dev_t cf_rdev;
unsigned int cf_nlink;
unsigned int cf_dtype;
struct timespec cf_atime;
struct timespec cf_mtime;
struct timespec cf_ctime;
static inline void free_dfs_info_param(struct dfs_info3_param *param)
if (param) {
static inline void free_dfs_info_array(struct dfs_info3_param *param,
int number_of_items)
int i;
if ((number_of_items == 0) || (param == NULL))
for (i = 0; i < number_of_items; i++) {
#define MID_FREE 0
#define MID_RETRY_NEEDED 8 /* session closed while this request out */
#define MID_SHUTDOWN 0x20
/* Types of response buffer returned from SendReceive2 */
#define CIFS_NO_BUFFER 0 /* Response buffer not returned */
#define CIFS_IOVEC 4 /* array of response buffers */
/* Type of Request to SendReceive2 */
#define CIFS_BLOCKING_OP 1 /* operation can block */
#define CIFS_ASYNC_OP 2 /* do not wait for response */
#define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */
#define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */
#define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */
#define CIFS_NO_RESP 0x040 /* no response buffer required */
/* Security Flags: indicate type of session setup needed */
#define CIFSSEC_MAY_SIGN 0x00001
#define CIFSSEC_MAY_NTLM 0x00002
#define CIFSSEC_MAY_NTLMV2 0x00004
#define CIFSSEC_MAY_KRB5 0x00008
#define CIFSSEC_MAY_LANMAN 0x00010
#define CIFSSEC_MAY_PLNTXT 0x00020
#endif /* weak passwords */
#define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */
#define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */
#define CIFSSEC_MUST_SIGN 0x01001
/* note that only one of the following can be set so the
result of setting MUST flags more than once will be to
require use of the stronger protocol */
#define CIFSSEC_MUST_NTLM 0x02002
#define CIFSSEC_MUST_NTLMV2 0x04004
#define CIFSSEC_MUST_KRB5 0x08008
#define CIFSSEC_MUST_LANMAN 0x10010
#define CIFSSEC_MUST_PLNTXT 0x20020
#define CIFSSEC_MASK 0xBF0BF /* allows weak security but also krb5 */
#define CIFSSEC_MASK 0xB70B7 /* current flags supported if weak */
#endif /* UPCALL */
#else /* do not allow weak pw hash */
#define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */
#define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */
#endif /* UPCALL */
#endif /* WEAK_PW_HASH */
#define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */
#define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */
* All constants go here
#define UID_HASH (16)
* Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
* following to be declared.
* Locking notes. All updates to global variables and lists should be
* protected by spinlocks or semaphores.
* Spinlocks
* ---------
* GlobalMid_Lock protects:
* list operations on pending_mid_q and oplockQ
* updates to XID counters, multiplex id and SMB sequence numbers
* cifs_file_list_lock protects:
* list operations on tcp and SMB session lists and tCon lists
* f_owner.lock protects certain per file struct operations
* mapping->page_lock protects certain per page operations
* Semaphores
* ----------
* sesSem operations on smb session
* tconSem operations on tree connection
* fh_sem file handle reconnection operations
#define GLOBAL_EXTERN extern
* the list of TCP_Server_Info structures, ie each of the sockets
* connecting our client to a distinct server (ip address), is
* chained together by cifs_tcp_ses_list. The list of all our SMB
* sessions (and from that the tree connections) can be found
* by iterating over cifs_tcp_ses_list
GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
* This lock protects the cifs_tcp_ses_list, the list of smb sessions per
* tcp session, and the list of tcon's per smb session. It also protects
* the reference counters for the server, smb session, and tcon. Finally,
* changes to the tcon->tidStatus should be done while holding this lock.
GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
* This lock protects the cifs_file->llist and cifs_file->flist
* list operations, and updates to some flags (cifs_file->invalidHandle)
* It will be moved to either use the tcon->stat_lock or equivalent later.
* If cifs_tcp_ses_lock and the lock below are both needed to be held, then
* the cifs_tcp_ses_lock must be grabbed first and released last.
GLOBAL_EXTERN spinlock_t cifs_file_list_lock;
#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
/* Outstanding dir notify requests */
GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
/* DirNotify response queue */
GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
* Global transaction id (XID) information
GLOBAL_EXTERN unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
GLOBAL_EXTERN unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
GLOBAL_EXTERN spinlock_t GlobalMid_Lock; /* protects above & list operations */
/* on midQ entries */
* Global counters, updated atomically
GLOBAL_EXTERN atomic_t sesInfoAllocCount;
GLOBAL_EXTERN atomic_t tconInfoAllocCount;
GLOBAL_EXTERN atomic_t tcpSesAllocCount;
GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
/* Various Debug counters */
GLOBAL_EXTERN atomic_t bufAllocCount; /* current number allocated */
GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
GLOBAL_EXTERN atomic_t totSmBufAllocCount;
GLOBAL_EXTERN atomic_t smBufAllocCount;
GLOBAL_EXTERN atomic_t midCount;
/* Misc globals */
GLOBAL_EXTERN unsigned int multiuser_mount; /* if enabled allows new sessions
to be established on existing mount if we
have the uid/password or Kerberos credential
or equivalent for current user */
GLOBAL_EXTERN unsigned int oplockEnabled;
GLOBAL_EXTERN unsigned int lookupCacheEnabled;
GLOBAL_EXTERN unsigned int global_secflags; /* if on, session setup sent
with more secure ntlmssp2 challenge/resp */
GLOBAL_EXTERN unsigned int sign_CIFS_PDUs; /* enable smb packet signing */
GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
GLOBAL_EXTERN unsigned int CIFSMaxBufSize; /* max size not including hdr */
GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */
GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */
GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
/* reconnect after this many failed echo attempts */
GLOBAL_EXTERN unsigned short echo_retries;
GLOBAL_EXTERN struct rb_root uidtree;
GLOBAL_EXTERN struct rb_root gidtree;
GLOBAL_EXTERN spinlock_t siduidlock;
GLOBAL_EXTERN spinlock_t sidgidlock;
void cifs_oplock_break(struct work_struct *work);
extern const struct slow_work_ops cifs_oplock_break_ops;
#endif /* _CIFS_GLOB_H */